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Southern Carroll H.S. WWTP

Sewage treatment plant, Eldersburg, Maryland. NPDES permit MD0024589, in force until Apr 30, 2030. Last 12 months: over a limit 3 times (last January 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (31 values), outfall 101 form A monthly (2 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
9 values over a limit, 0 required values missing, 0 of 17 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
October 2025Nitrogen, ammonia total [as N], maximum monthly average2.6 mg/L≤ 2.2 mg/L18%
January 2026Nitrogen, ammonia total [as N], maximum monthly average6.1 mg/L≤ 5.6 mg/L9%
January 2026Nitrogen, ammonia total [as N], maximum daily average12.3 mg/L≤ 11.5 mg/L7%

Limits in force (37)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitmaximumreport only (deg F)all year001
Temperature, water deg. fahrenheitmaximumreport only (deg F)all year001
Temperature, water deg. fahrenheitmaximumreport only (deg F)all year001
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/Lall year001
Oxygen, dissolved [DO]daily average minimum≥ 6 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 13 lb/dall year001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 19 lb/dall year001
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 8.5 SUall year001
Solids, total suspendedmaximum monthly average≤ 30 mg/Lall year001
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall year001
Solids, total suspendedmaximum monthly average≤ 13 lb/dall year001
Solids, total suspendedmaximum weekly average≤ 19 lb/dall year001
Nitrogen, organic total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]maximum monthly average≤ 2.2 mg/LMay–Oct001
Nitrogen, ammonia total [as N]maximum monthly average≤ 5.6 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]maximum daily average≤ 9.6 mg/LMay–Oct001
Nitrogen, ammonia total [as N]maximum daily average≤ 11.5 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]maximum monthly average≤ .92 lb/dMay–Oct001
Nitrogen, ammonia total [as N]maximum monthly average≤ 2.3 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]maximum daily average≤ 4 lb/dMay–Oct001
Nitrogen, ammonia total [as N]maximum daily average≤ 4.8 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year001
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]maximum monthly average≤ .8 mg/Lall year001
Phosphorus, total [as P]maximum weekly average≤ 1.2 mg/Lall year001
Phosphorus, total [as P]maximum monthly average≤ .33 lb/dall year001
Phosphorus, total [as P]maximum weekly average≤ .5 lb/dall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
E. colimaximum monthly geometric mean≤ 126 MPN/100mLall year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year101
Solids, total suspendedmonthly averagereport only (mg/L)all year101

New limits from Nov 1, 2026

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], maximum monthly average1.4 lb/d (Jan, Feb, Mar, Apr, Nov, Dec)tighter0.195 lb/d (6 values)0.139×
Nitrogen, ammonia total [as N], maximum monthly average3.4 mg/L (Jan, Feb, Mar, Apr, Nov, Dec)tighter3.1 mg/L (6 values)0.912×
Nitrogen, ammonia total [as N], maximum monthly average0.63 lb/d (May–Oct)tighter0 lb/d (5 values)0×
Nitrogen, ammonia total [as N], maximum monthly average1.5 mg/L (May–Oct)tighter0.1 mg/L (5 values)0.0667×
Nitrogen, ammonia total [as N], maximum daily average7.1 mg/L (May–Oct)tighter0.2 mg/L (5 values)0.0282×
Nitrogen, ammonia total [as N], maximum daily average3 lb/d (May–Oct)tighter0 lb/d (5 values)0×

How strict are these limits?

Cited limits by parameter: Maryland's rules and the federal ones.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MD0024589 · MCP: https://passage-data.com/mcp